Expand Support for other PyArrow timestamp precisions on write

[sungwy]

This issue tracks the work of expanding the support of the write API to other timestamp precisions. Currently only microseconds precision is supported in Iceberg, so we should cast the other precisions to microseconds to enable writes.

[kevinjqliu]

I think #541 is related

[sungwy]

Thanks! I'll close this issue in lieu of the other one